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Q. A trajectile, of mass 20 g, travelling at 350 m/s, strikes a steel plate at an angle of 30-degrees with a plane of the plate. It ricochets off at the similar angle, at a speed of 320 m/s. What is the magnitude of the impulse that the steel plate gives to the trajectile?

Q. A 69.00 kg person on skis is going down a hill sloped at 30° from the horizontal. The coefficient of friction between the skis and the snow is 0.20. What would be magnitude of the acceleration?

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